On all the default multiplayer maps except for "Pavlov," it's the Allied forces attempting to search out and destroy a specific target, usually a gun emplacement. These maps typically have two potential targets for the Allied forces, so the Axis cannot simply camp out the one target and wait -- the Allied forces win if they destroy either target. The Axis win a round by killing the entire Allied team, by defusing a planted bomb, or by letting the timer run out.